How to copy an annotation

To copy notes wit or without attachments I have prepared this snippet.

//Copy attributes
annotation newAnnotation = new annotation();
newAnnotation.langid = sourceAnnotation.langid;
newAnnotation.notetext = sourceAnnotation.notetext;
newAnnotation.subject = sourceAnnotation.subject;
newAnnotation.objecttypecode = new EntityNameReference();
newAnnotation.objecttypecode.Value = destinationEntityName;

//Set the destination entity ID
newAnnotation.objectid = new Lookup();
newAnnotation.objectid.type = destinationEntityName;
newAnnotation.objectid.Value = destinationEntityId;

//Create annotation
Guid newAnnotationId = _crmService.Create(newAnnotation);
if (sourceAnnotation.isdocument.Value)
{
byte[] data = GetAnnotationAttachment(sourceAnnotation.annotationid.Value);
string base64data = System.Convert.ToBase64String(data);
AddAttachment(newAnnotationId, base64data, sourceAnnotation.mimetype, sourceAnnotation.filename);
}

The code for GetAnnotationAttachment is here.

The code for AddAttachment is here.